VOLTCRAFT VC-330 Bedienungsanleitung Seite 40

Measuring alternating currents with 400 Hz low-pass filter
The current clamp comes with a 400 Hz software low-pass filter which can be switched on
when needed.
Follow the steps below to measure an alternating current with the low-pass filter.
• Turn on the product using the rotary switch and select the 2A
measurement range.
• Press and hold the SELECT/V.F.C button (4) for approx. 2 seconds to enable the low-pass
filter. You will hear 3 beep tones and < UFC > will be briefly displayed on the LCD display.
< VFC > (D) will then be displayed on the LCD.
• Proceed with the measurement according to steps 3 to 5 in "Measuring alternating currents
(A )".
• To disable the low-pass filter, press and hold the SELECT/V.F.C button for approx. 2
seconds. You will hear a beep tone and < End > will be briefly displayed on the LCD display.
Measuring direct currents (A
• Turn on the product using the rotary switch and select the 2A
measurement range. Briefly press the SELECT/V.F.C button (4) to switch to the DC
measurement range. < DC > and < A > appear on the display.
• Due to the high sensitivity and the ambient magnetic field
(e.g. the earth's magnetic field), a small current will always
be displayed when the current clamp is closed and in the
direct current measurement range. Manually reset the display
to zero immediately before each measurement or when the
cable is changed.
• Set the display to zero without a conductor and when the
clamp is closed by briefly pressing the ZERO button (9). The
zero reset is confirmed by a beep tone and < ZERO > will
appear on the LCD display. Briefly pressing the ZERO button
will reset the display to zero again. To disable this function, press and hold the ZERO button
for approx. 2 seconds. The < ZERO > symbol disappears. This will take you back to the
normal measuring mode without the zero reset.
• Always ensure the correct polarity of the current clamp for direct current measurements. The
/ polarity symbols are located on the front and back of the current clamp. The cable
from the current source (+) must run from the front through the current clamp to the load
(figure 3).
40
)
, 20A or 100A
, 20A or 100A
CAT II
600V
CAT III
300V
100A
Figure 3